class_docstr: Test that utility functions for fusing two qml.Rot gates function as expected.
docstr: Test that products of quaternions produce expected results.
docstr_tok: ["Test","that","products","of","quaternions","produce","expected","results","."]
code: def test_quaternion_product(self, angles_1, angles_2, expected_quat):
      """Test that products of quaternions produce expected results."""
      obtained_quat = _quaternion_product(angles_1, angles_2)
      assert qml.math.allclose(obtained_quat, expected_quat)
  
file_path: pennylane/tests/transforms/test_optimization/test_optimization_utils.py
imports: import pytest
  from utils import check_matrix_equivalence
  from pennylane.transforms.optimization.optimization_utils import find_next_gate, _zyz_to_quat, _quaternion_product, fuse_rot_angles
  import pennylane
  from pennylane import numpy
label_desc: Use image node_id 2 for calling the TestRotGateFusion obj's underlying member method code with example usage: obj.test_quaternion_product(angles_1, angles_2, expected_quat) without return types